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Friday, August 14, 2009

Less Lead In Obama Garden

Earlier tests revealed that the Obama Vegetable Garden contained lead levels of 93 parts per million (p.p.m.). According to the U.S. Environmental Protection Agency, lead-concentration in soil is not hazardous until it reaches 400 p.p.m. Nevertheless, President Obama had work done to the garden to further reduce lead-concentration levels.

The soil was amended with lime, green sand, crab meal and compost made by the National Park Service. The pH was also adjusted between 6.5 and 7 because lead is unavailable to plants when the pH level is in that range. The lead-concentration level is now 14 p.p.m, which means the soil is now comparable to soil in places where there are no automobiles!

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